new board, strange motor behaviour (2 replies)

Hello, I recently fried my Ramps Controller, I was doing a long print overnight, I woke up quite late and decided to go and check on the machine, the feed had blocked, no big deal, it happens sometime. My ramps controller is in a nest of wires though so to terminate the print I usually flip the socket instead of pressing the reset, I have to switch it off and then back off so that the fans keep running to cool down the hotend and keep the blockage from getting worse. Anyway I switched it on and off a little too quickly and shorted my 12v supply. Luckily I had another one on hand, unluckily I am a total moron and in my sleepy stupor I got the + and - mixed up and fried the board.
So I ordered another board, just the top part, the original arduino is still in use and hooked it up today. The endstops and SD card are working fine as well as the bed and hotend heaters and thermistors however the motors make a huge ammount of noise and don't really get moving at all (X and Z move a little, Y stutters back and forth, though I may have gotten the wires mixed up on the Y, the other two are 4pin plugs the Y is mashed together from jumper pins). The drivers are from the original top board.
Do I need to replace all my stepper drivers or could it be that my arduino is slightly fried and needs replacing?

Tl;DR:
Fried board with reversed polarity, replaced shield board, motors not working everything else fine- replace arduino/replace stepper drivers or what?

Thanks for reading : )